Supergirl #18

"PLAIN SIGHT" finale! Director Bones and the D.E.O. put innocent lives at risk when they unleash a psychotic alien on the National City Solstice Semiformal with the hopes of exposing Supergirl. With the alien claiming the only way the Earth can stay pure is to eradicate Supergirl, Kara finds herself pushed to the edge and forced not to stay silent anymore. Supergirl must finally stand as the hero National City needs.